Founding Software Engineer – Payments & Billing Platform

About the role

We are looking for a Founding Software Engineer to lead the core payments, billing and integration platform that powers ShareShare’s internet infrastructure network across Africa. You will work directly with the CTO and a small, high‑intensity engineering team to build production‑grade services that handle real financial transactions for ISP partners.

Key responsibilities

• Own the end‑to‑end payments pipeline, including collections, revenue‑splitting and treasury operations.
• Design and implement the billing engine covering subscription lifecycle, cycle management and automated renewals.
• Build and maintain the integration layer that synchronises BSS/OSS data with partner systems.
• Define database schemas, write migrations and ensure transaction isolation for financial data in PostgreSQL.
• Develop event‑driven microservices using Kafka or RabbitMQ and apply appropriate request‑reply or fire‑and‑forget patterns.
• Integrate with payment gateways such as M‑Pay, Stripe or Adyen, handling STK push flows, webhook idempotency, signature verification and reconciliation.
• Collaborate with the team to turn specification documents into production code without breaking tasks into tickets.

Required profile

• 7+ years of professional software engineering experience, with at least 3 years building backend systems that process real financial transactions.
• Deep expertise in TypeScript/Node.js and ability to design NestJS microservices from scratch.
• Strong knowledge of PostgreSQL schema design, migrations and transaction handling.
• Experience with event‑driven architectures (Kafka, RabbitMQ) and payment gateway integrations.
• Proven track record of shipping production code end‑to‑end.
• Daily use of AI coding assistants (Claude, Cursor, Copilot) and ability to articulate their impact on your workflow.

Required skills

• TypeScript
• Node.js
• NestJS
• PostgreSQL
• Kafka or RabbitMQ
• M‑Pesa, Stripe, Adyen integration
• STK push flows, webhook idempotency, signature verification, reconciliation
• Event‑driven microservices
• AI coding assistants (Claude, Cursor, Copilot)